J = C - 12000
C = C
i = 20/100 = 2/10
t= 3
i.t = 6/10
J = C.i.t
C-12000 = 6/10.C
(C-1200) / (6/10) = C
{C - 12000.(10)} / 6 = C
10C - 120000 = 6.C
4C - 120000 = 0
4C = 120000
C = 30000
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Verified answer
J = C - 12000
C = C
i = 20/100 = 2/10
t= 3
i.t = 6/10
J = C.i.t
C-12000 = 6/10.C
(C-1200) / (6/10) = C
{C - 12000.(10)} / 6 = C
10C - 120000 = 6.C
4C - 120000 = 0
4C = 120000
C = 30000